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Guillermo Cassini

Guillermo Cassini
Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" - División Mastozoología · Universidad Nacional de Luján - Departamento de Ciencias Básicas

Doctor en Ciencias Naturales

About

99
Publications
30,668
Reads
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1,292
Citations
Education
April 2007 - February 2011
Universidad Nacional de La Plata
Field of study
  • Morfología Funcional; Biomecánica; Ecomorfología; Paleobiología
March 1994 - March 2001
Universidad Nacional de Luján
Field of study
  • Ciencias Biológicas

Publications

Publications (99)
Article
Full-text available
Optimising conservation efforts requires an accurate record of the extant species as well as their geographic distributions. Nevertheless, most current conservation strategies start from an incomplete biodiversity inventory. Argentina has an extraordinary diversity of species, however, until now an updated inventory of its fauna has not been carrie...
Book
Full-text available
Un inventario biológico enumera, ordena, cataloga y/o cuantifica ecorregiones, ecosistemas o especies. Es una herramienta básica y fundamental de gestión ambiental, que, al mismo tiempo, constituye la primera medida de conservación, dado que no se puede cuidar aquello que es ignorado. El presente Inventario Biológico Argentino es el esfuerzo de un...
Article
Information on dietary ecology plays a key role in a wide array of biological research and conservation decisions, but its availability is biased towards large and charismatic taxa, whereas small mammals are underrepresented. Of the scarce publications on the Neotropical sigmodontine rodents, most are concentrated in central-eastern Argentina, and,...
Article
Full-text available
South American Canids are endemic and form a monophyletic clade supported by molecular and morphological data, with the exception of Urocyon cinereoargenteus, which is a typical North American form. South American canids occur in almost all environments in continent, and exhibit diet diversity and large size variation. Here we analyzed the skull on...
Article
Full-text available
South American cervids have a relatively recent evolutionary history in the Neotropics. Present taxonomical richness includes six genera and 17 species grouped in at least two clades, Blastocerina and Odocoileina. With few exceptions, functional morphology or ecomorphological approaches have not been rigorously applied to the masticatory apparatus...
Article
Full-text available
Xenarthra, one of the major clades of placentals, comprises two different lineages (sloths and anteaters, and armadillos) with extant representatives showing strongly different morphologies and life habits. Sloths are arboreal herbivores, anteaters are insectivores with digging/climbing abilities, and armadillos are terrestrial diggers with varied...
Article
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Understanding the interplay between morphological integration and modularity is considered an important topic in the study of the evolution of the form of complex structures. The mandible is a complex structure that can be shaped by diverse factors such as ontogeny, ecology, and evolutionary history. In canids, this is particularly interesting beca...
Article
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This special issue of the Journal of Mammalian Evolution represents the proceedings from a symposium held in conjunction with the XXXI Jornadas Argentinas de Mastozoología (SAREM, La Rioja, Argentina, October 25, 2018), and entitled “El paradigma de correlación forma-función en mastozoología: un tributo a Leonard Radinsky (1937–1985).” In this intr...
Article
Hindlimbs of raptors play an essential role in feeding due to the grasping abilities that allow them to hunt and kill their prey. This study explores and quantifies for the first time the structural and mechanical features of the digit flexor muscles in one of the largest piscivorous European raptors, the white-tailed sea eagle. We studied the myol...
Article
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The anthropic effect associated with worldwide European settlements over the last 500 years has caused dramatic environmental changes, modified regional patterns of biodiversity, and often led to local or complete extinctions. The sigmodontine rodents of Bahía Samborombón (Humid Pampas, central-eastern Argentina) constitute a good case study: a lat...
Article
A R T I C L E I N F O Keywords: Caviomorpha functional morphology postcranial indices skeletal morphology substrate preference A B S T R A C T Rodents of the family Octodontidae, endemic to South America, represent a group with low taxonomic richness group (six genera and 14 species) but have great ecomorphological diversity with epigean, semi-foss...
Article
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Three-dimensional (3D) surface scanning includes techniques of image acquisition and image processing. Among the former, hard- ware devices (e.g., portable and non-portable scanners, camera) capture images from the target, whereas image processing is conducted via specialized software, in which acquired images are processed to merge them into a sin...
Article
The lower Miocene Santa Cruz Formation (dated to ~18–16 Ma) of Southern Patagonia, Argentina, preserves rich vertebrate faunas, which are representative of communities that existed prior to the Great American Biotic Interchange (GABI). Some previous researchers have hypothesized that these pre-GABI faunas had a low richness of mammalian carnivores...
Article
Full-text available
The pichi (Zaedyus pichiy; Cingulata: Chlamyphoridae) is an armadillo whose ectoparasite fauna is composed of ticks and fleas. Fleas were collected from 218 pichis in southern Mendoza, Argentina, in summer and winter of 2015 and 2016. Prevalences were analyzed and differences in the intensities of the total number of fleas related to host (age, sex...
Conference Paper
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Los murciélagos filostómidos son uno de los clados de mamíferos neotropicales con mayor diversidad trófica y morfológica. Dentro de este grupo, las formas frugívoras muestran una preferencia dietaria hacia diferentes tipos de plantas, influenciada por su distribución geográfica. En este trabajo se estudió la covariación entre la morfología del apar...
Poster
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Con aproximadamente 103 especies, el género Myotis es el más diverso de la familia Vespertilionidae. En América del Sur se han reconocido 21, de las cuales 12 habitan en Argentina. Estos murciélagos son de tamaño pequeño (<11 g) y dieta mayormente insectívora.
Article
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Dicynodont therapsids were a major component of the Permo-Triassic terrestrial ecosystems across Pangea and have been regarded as specialized herbivores. In South America, the group was represented by several taxa of the clade Kannemeyeriiformes spanning from the Middle to the Late Triassic. In order to evaluate if cranial differences among taxa ar...
Article
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Extant hyraxes are small, rabbit-sized, herbivorous paenungulates, with a notable feeding mechanism: they crop with the molars instead of the incisors, unlike most modern hoofed mammals. We investigated the postnatal development of the skull, and their functional correlates, in two extant representative forms of hyraxes, the terrestrial grazer Proc...
Article
Una importante colaboración entre epidemiólogos y zoólogos planteó dudas sobre la taxonomía de las mulitas que solo despejó la reciente genética molecular.
Article
Una importante colaboración entre epidemiólogos y zoólogos planteó dudas sobre la taxonomía de las mulitas que solo despejó la reciente genética molecular.
Poster
Full-text available
Antifer es el cérvido más grande para el Cuaternario de América del Sur, conocido hasta la fecha solo por sus astas. Presentamos aquí el primer molde endocraneano de este taxón, en base a tomografías computadas del neurocráneo de un individuo adulto (MRS 202) con volteo completo. El mismo proviene del Pleistoceno Tardío (edades OSL 84- 95 ka AP) de...
Article
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During almost two centuries, two available specific epithets have competed for the southern sea lions of the genus Otaria Péron, 1816 (Fig. 1), which is classically regarded as monotypic (but see below). The species distributes more or less continuously along the Atlantic coast from southern Brazil south to Cape Horn and along the Pacific from nort...
Article
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Esta sección especial de la Revista del Museo Argentino de Ciencias Naturales nueva serie coincide con el 90 aniversario de la incorporación del Dr. José Yepes (1897-1976) al frente de la Colección Nacional de Mastozoología. En esta introducción, repasamos el contenido de los trabajos que componen la presente sección, con la cual pretendemos rendir...
Article
Ontogenetic variation of cranial characters used in crocodylian phylogenetic systematics has never been studied. Furthermore, the relationship between diet and skull morphological transformation during ontogeny has not been properly explored yet. We quantify the inter- and intraspecific skull morphological variation in extant caiman species focusin...
Article
Full-text available
The long-nosed armadillos of the Dasypus genus are the richest and more widespread extant xenarthra. In 1933, the prominent Argentinean mammalogist José Yepes studied specimens collected by Salvador Mazza and named a new species: D. mazzai. Several authors interpreted that the holotype of the species was a juvenile of D. novemcinctus. In 1995, Vizc...
Article
Full-text available
INTRODUCCIÓN La taxonomía es una disciplina dinámica, donde nuevas aproximaciones generan con frecuencia ajustes en las hipótesis sobre las relaciones evolutivas entre distintos taxones (e.g., Padial et al. 2010). Para que las clasificaciones taxo-nómicas reflejen este dinamismo, deben ser actualizadas con cierta regularidad. En este contexto, cont...
Article
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Understanding the mechanisms responsible for phenotypic diversification, and the associated underlying constraints and ecological factors represents a central issue in evolutionary biology. Mammals present a wide variety of sizes and shapes, and are characterized by a high number of morphological convergences that are hypothesized to reflect simila...
Article
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This special section of the Revista del Museo Argentino de Ciencias Naturales nueva serie coincides with the 90th anniversary of the incorporation of Dr. José Yepes (1897-1976) at the head of the Colección Nacional de Mastozoología. In this introduction, we review the content of the contributions that make up this section, with which we intend to h...
Article
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We present a revised checklist of the mammals of Argentina, incorporating recent taxonomical changes and new records of mammals for the country produced since the publication of a previous list in 2006. We recordered 409 native species, corresponding to 181 genera, 46 families and 12 orders, plus 23 introduced taxa with wild populations.
Article
Full-text available
South American native ungulates include several extinct lineages that evolved within the context of South American Cenozoic geographic isolation. By the late early Miocene Santacrucian Age, the orders Notoungulata, Litopterna, and Astrapotheria were differentiated. Recent ecomorphological studies highlighted complex functional patterns between thei...
Article
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Fleas (Siphonaptera) of an isolated population of Chaetophractus vellerosus (Mammalia: Xenarthra) from Magdalena (Buenos Aires province) were studied, and their presence was associated with host-related factors (age, sex, weight, size, and physical condition) and temporal dynamics (seasonality and year). Three species of fleas were identified: Poly...
Chapter
La paleobiología reconstruye la historia de vida de taxones extintos. Una forma de estudiar la paleobiología de vertebrados es asumir que existe una estrecha relación entre forma y función, de manera que la última puede inferirse a partir de la primera (principio de correlación forma-función). Este enfoque integrador combina la biología de vertebra...
Article
Full-text available
Notoungulates, native South American fossil mammals, have been recently objective of several palaeoecological studies. Ecomorphology and biomechanics of the masticatory apparatus, together with micro and mesowear analyses on tooth enamel, were applied in order to understand their palaeobiology. In particular, the relationship between some dental tr...
Article
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Articular surfaces reflect the relative movements between adjacent bones, and the ones involved in the elbow joint provide information about forelimb movements and may be useful for making inferences about the substrate use. The proximal articular surface of the ulna was examined through 3-D geometric morphometrics, in order to assess its usefulnes...
Article
The Panthera lineage is a monophyletic clade of felids, supported by both morphological and molecular evidence. The lineage includes large species with cranial similarity such as Panthera leo and P. tigris, and other with very different cranium such as P. pardus. The aim of our work was to study the cranial ontogeny of Pantherines, elucidating whet...
Article
Full-text available
South American artiodactyls have a Holartic origin and reached the continent during the Great American Biotic Interchange. Among the 10 extant artiodactyl families, three, Tayassuidae, Camelidae and Cervidae arrived and survived to the present. They participate in the megahervibore climax of spectacularity during the Quaternary, but did not occupy...
Book
Full-text available
Nuestra formación en el estudio de la forma y función ha tenido y tiene gran parte de prueba y error. Hay mucho material para estudiar, muchas problemáticas que abordar y mucho de marco conceptual y metodología que aprender. O desarrollar… En este proceso ha sido y es crucial el aporte de los editores y revisores de nuestros trabajos. Los manuscrit...
Article
Full-text available
Hairy armadillos constitute an ecologically homogeneous and morphologically similar group with currently 5 species classified in the subfamily Euphractinae. Among them, the Andean hairy armadillo Chaetophractus nationi (Xenarthra, Cingulata, Dasypodidae) is a small, endangered armadillo that has long been suspected to represent a high-altitude vari...
Article
We analysed the cranial ontogeny of male Arctocephalus australis (Zimmermann, 1783) (N = 116), Arctocephalus gazella (Peters, 1875) (N = 69), and Arctocephalus tropicalis (Gray, 1872) (N = 51) to study skull growth and its allometric patterns in the genus. We used 15 metric variables with bivariate and multivariate approaches to detect interspecifi...
Article
Full-text available
The aim of this study was to analyze the parasitic fauna of a population of Chaetophractus vellerosus from Magdalena, Buenos Aires province, Argentina, by parasitological analysis. We evaluated the influence on the parasitic dynamics of different host parameters —age, sex, height and weight— as well as seasonality, vegetation and human impact. Oocy...
Article
Miocene deposits of the Santa Cruz Formation, Patagonia, comprise a diverse and excellently preserved vertebrate fauna, allowing detailed paleobiological and paleoecological studies based on three ecological parameters: body mass, diet, and substrate preference. In contrast to the small and arboreal extant sloths, Bradypus and Choloepus, Santacruci...
Article
At a time when continuum mechanics proposes a unified model for rigid bodies, deformable solids, and fluids using sophisticated mathematical descriptions, it is a courageous intellectual challenge to advance a classic Newtonian approach to explain the mechanics of the mammalian jaw. The Greek mathematician Archimedes (c.287 BC − c.212 BC) proposed...
Article
Full-text available
Presentamos el primer estudio sobre la disparidad craneana en C. yacare y C. latirostris utilizando un análisis de morfometría geométrica en dos dimensiones. Se fotografiaron cráneos de distintos estadios ontogenéticos en vista dorsal y palatal. Se establecieron 28 landmarks en vista dorsal y 27 en vista palatal y se digitalizaron usando TPSUtil y...
Article
The pampas deer Ozotoceros bezoarticus is a medium-sized, elegant, and lightly built cervid that was once a characteristic inhabitant of open grasslands across a wide geographical distribution in South America. In Argentina, the subspecies Ozotoceros bezoarticus celer is the most southern and abundant populations and relatively well represented in...